Universality conjecture for critical one-dimensional random Schrödinger operators

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Let EE be distributed according to the arcsine law, UU be uniform on [0,1][0,1], and let Z\mathcal{Z} be a standard two-sided Brownian motion started from 00, independent of EE and UU. Define

ρ(E)=11−E2/41∣E∣<2,τ(E)=(σρ(E))2,\rho(E)=\frac{1}{\sqrt{1-E^2/4}}\mathbf{1}_{|E|<2},\qquad \tau(E)=(\sigma\rho(E))^2,

and

S(t)=exp⁡(Zt2−∣t∣4).S(t)=\exp\left(\frac{\mathcal{Z}_t}{\sqrt{2}}-\frac{|t|}{4}\right).

Let HnH_n be the finite one-dimensional random Schrödinger operator, choose an eigenvalue μ\mu uniformly from its eigenvalues, and let ψμ\psi^\mu be the corresponding normalized eigenvector. Universality conjecture. The scaling limit of the eigenvector picked from the spectral measure at zero of the infinite one-dimensional random Schrödinger operator is as described by

(μ,n∣ψμ(⌊nt⌋)∣2dt)⇒(E,S(τ(E)(t−U))dt∫01ds S(τ(E)(s−U))).\left( \mu, n\left|\psi^\mu(\lfloor nt\rfloor)\right|^2dt\right)\Rightarrow\left(E,\frac{S(\tau(E)(t-U))dt}{\int_0^1ds\,S(\tau(E)(s-U))}\right).

This conjecture proposes universality of the critical eigenvector scaling limit beyond the discrete model studied in the paper, in the Poisson limit. The source does not state a resolution or provide further evidence of known cases, so its status remains open.

References

Primary source

Ben Rifkind and Balint Virag, “Eigenvectors of the critical 1-dimensional random Schroedinger operator”, arXiv:1605.00118 (2018).

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